Selective Activation Discriminator. We report the ablative studies of selective activation discriminator in Table REF . Motivated by discriminator-free method [1]}, we discard the student discriminator and train the lightweight generator only with \(L_{distill}\) , which obtains 35.50 mIOU. It may be due to the fact that although the discriminator-free method avoids the model collapse issue, it fails to take good advantage of GAN loss to provide more supervision information for the lightweight generator. In order to investigate whether selective activation discriminator and global coordination constraint \(L_{global}\)  can work synergistically, we discard one of them and the experimental results indicate that the selective activation discriminator and \(L_{global}\)  work mutually to achieve impressive results.
